Please realize, this has nothing to do with your parenting skills. We all raise our children to the best of our ability. Hopefully we give them the tools to make the right choice when they are in testing situations. We have to let go of our pride, and realize it has nothing to do with us, it has to do with them, their choices.
You have received calls from the college, and from the police. This is way over the top of any "normal" behaviors. Yes, the first time children leave the safety of our home, they may act out, they may not.
When they are putting themselves in harms way by abusing their bodies with alcohol, acting out, and being warned that this is all unacceptable behavior, as parents we either must set boundaries that we will be able to follow thru on.
By her actions she has given up certain rights., you have to define those rights. Wether it is a curfew, not going back to school, etc...and you have to enforce them.
She is testing you right now...it is your choice to pass her, or fail her.